text file compare vb 2005

Hi
I have a text file on pc where the ticker and the name of the company are saved.
I download the same file from internet.

By ex
text file on pc dowload text file
coms 3 com coms 3com

How can i update the text file so that it by the same of the download file.
The ticker coms can change the name of the compy ore the compay can by deleted form the download file . So i have to update the text file on pc.

How can i do that
Greetings Glenn

Are you saying you want to replace the existing local file with the new downloaded file, or you just want to edit parts of the existing file?

edit parts of the existing file

when the ticker , name change or when it not exist any more i have to deleted on the text file on pc